Locale Management With Hierarchical Fallback Chains And Regional Variants

** - Make your AI agent speak every language on the planet, using [Lingo.dev](https://lingo.dev) Localization Engine.

Unique: Implements hierarchical locale fallback chains that allow regional language variants (en-US, en-GB) to inherit from base languages (en) without duplication, reducing translation volume while maintaining locale-specific customization where needed.

vs others: More sophisticated than simple locale switching in libraries like i18next; enables cost-effective multilingual support for applications with many regional variants by reusing base language translations.